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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a7ee1464f11b9f78611721be9a839c178cbc1c6bbb65e09559fdd8e7182604' 
  AND token = 'Hf+BXBTWsl9tqyseh/wd0DSsCaE+k/miwAA5NWux6Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}